<?php
namespace ESign;

/**
* Implementation of VerificationIF for hashing a signable object
*
* Copyright (C) 2013 OEMR 501c3 www.oemr.org
*
* LICENSE: This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 3
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://opensource.org/licenses/gpl-license.php>;.
*
* @package OpenEMR
* @author  Ken Chapple <ken@mi-squared.com>
* @author  Medical Information Integration, LLC
* @link    http://www.open-emr.org
**/

require_once $GLOBALS['srcdir'].'/ESign/VerificationIF.php';

class Utils_Verification implements VerificationIF
{
    public function hash($data)
    {
        $string = "";
        if (is_array($data)) {
            $string = $this->stringifyArray($data);
        } else {
            $string = $data;
        }

        $hash = sha1($string);
        return $hash;
    }

    protected function stringifyArray(array $arr)
    {
        $string = "";
        foreach ($arr as $part) {
            if (is_array($part)) {
                $string .= $this->stringifyArray($part);
            } else {
                $string .= $part;
            }
        }

        return $string;
    }
    
    public function verify($data, $hash)
    {
        $currentHash = $this->hash($data);
        if ($currentHash == $hash) {
            return true;
        }
        
        return false;
    }
}
